Apparatus and Method for Driving Liquid Crystal Display Device

1. An apparatus for driving a liquid crystal display device, comprising: a liquid crystal panel having a plurality of gate lines and a plurality of data lines, the gate lines being arranged to cross the data lines to define liquid crystal cell areas comprising a liquid crystal; a gate driver driving the gate lines; a data driver driving the data lines; a data converter coupled to the data driver, generating a modulated data for increasing or decreasing a response speed of the liquid crystal in response to an input data; and a timing controller controlling a driving time of the data and gate drivers and supplying data signal to the data converter; where the data driver converts the modulated data into an analog video signal to supply it to the respective data lines, where the data converter comprises: a memory storing the input data for a unit of a frame; a first look-up table generating a first modulated data for increasing the response speed of the liquid crystal, in response to the input data of a current frame supplied from the timing controller and data of a previous frame supplied from the memory, where the first modulated data comprises a modulated data with a magnitude larger than a magnitude of the input data; a second look-up table generating a second modulated data for decreasing the response speed of the liquid crystal, in response to the input data of the current frame and the data of the previous frame, where the second modulated data comprises a modulated data with a magnitude smaller than a magnitude of the input data; a data comparator comparing the input data of the current frame with the data of the previous frame to generate a mode selection signal for indicating a moving image or non-moving image; and a first selector that selects the first modulated data in response to the mode selection signal indicating the moving image or selects the second modulated data in response to the mode selection signal indicating the non-moving image, and outputs the selected first or second modulated data signal to the data driver, where the timing controller is configured to generate a data selection signal that time-divides one frame into a first and a second period, and supplies the data selection signal to the data converter, where the data converter further comprises: a second selector configured to supply the first or second modulated data to the data driver for the first period in response to the data selection signal, and then supply the input data of the current frame to the data driver for the second period, where the data driver converts the modulated data into the analog video signal to supply it to the respective data lines for the first period, and then converts the input data of the current frame into an analog video signal to supply it to the respective data lines for the second period.

2. The apparatus of claim 1 , where the timing controller includes the data converter.

3. An apparatus that drives a liquid crystal display device, comprising: a memory storing the input data for a unit of a frame; a first look-up table generating a first modulated data for increasing the response speed of the liquid crystal, in response to the input data of a current frame and data of a previous frame supplied from the memory, where the first modulated data comprises a modulated data with a magnitude larger than a magnitude of the input data; a second look-up table generating a second modulated data for decreasing the response speed of the liquid crystal, in response to the input data of the current frame and the data of the previous frame, where the second modulated data comprises a modulated data with a magnitude smaller than a magnitude of the input data; a data comparator comparing the input data of the current frame with the data of the previous frame to generate a mode selection signal for indicating a moving image or non-moving image; a first selector that selects the first modulated data in response to the mode selection signal indicating the moving image or the second modulated data in response to the mode selection signal indicating the non-moving image; and a second selector that selects the modulated data from the first selector for the first period, and then selects the input data of the current frame for the second period.

4. A method of driving a liquid crystal display device including a liquid crystal panel having a plurality of gate lines and a plurality of data lines, the gate lines being arranged to cross the data lines to define liquid crystal cell areas comprising a liquid crystal, comprising: generating a first modulated data for increasing a response speed of the liquid crystal in response to an input data of a current frame and data of a previous frame, where the first modulated data comprises a modulated data with a magnitude larger than a magnitude of the input data of the current frame; generating a second modulated data for decreasing a response speed of the liquid crystal in response to the input data of the current frame and the data of the previous frame, where the second modulated data comprises a modulated data with a magnitude smaller than a magnitude of the input data of the current frame; comparing the input data of the current frame with data of the previous frame to detect a moving image or non-moving image; selecting the first modulated data when the moving image or the second modulated data when the non-moving image; time-dividing a frame into first and second periods; selecting the modulated data to supply it to the respective data lines for the first period; and selecting the input data of the current frame to supply it to the respective data lines for the second period.